Chromium is a mineral. It is called an "essential trace element" because very small amounts of chromium are necessary for human health.
Chromium is used for improving blood sugar control in people with prediabetes, type 1 and type 2 diabetes, and high blood sugar due to taking steroids and HIV treatments.
It is also used for depression, Turner's syndrome, polycystic ovary syndrome (PCOS), lowering "bad" cholesterol, raising "good" cholesterol in people taking heart medications called beta-blockers, metabolic syndrome, heart attack, schizophrenia, bipolar disorder, and binge eating disorder.
Some people try chromium for body conditioning including weight loss, increasing muscle, and decreasing body fat. Chromium is also used to improve athletic performance, to increase energy, and to prevent age-related mental decline.